Reddit reviews Kalevel 120pcs Breadboards Jumper Wires Male to Female Jumper Wires Male to Male Jumper Wires Female to Female Jumper Wires Kit Long Ribbon Cable 20cm (m-m, f-f, m-f)
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Each cable length: about 20cm /8-inch.Including : 40-pin male to female jumper wires + 40-pin male to male cable + 40-pin female to female cable =120pcs in totalThe male ends meant for insertion into standard 0.1"(2.54mm) female sockets and the female ends are meant for insertion onto standard 0.1"(2.54mm) male headersThe cables can be separated to form an assembly containing the number of wires you require for your connection and to support non-standard odd-spaced headers.Made of high-grade copper wire material for safe and durable to use
The board is called a 'breadboard' or prototyping board. The wires, such as what's connecting to the GPIO headers, is called a jumper wire. The ones I buy are usually bundled like this.
.1" header leads, M/M M/F F/F like these.
https://www.amazon.com/gp/product/B00M5WLZDW
Looks like you want these: https://www.amazon.com/dp/B00M5WLZDW
I have the exact same setup. It works!
First, order the correct MinimOSD board pre-flashed with MWOSD firmware, and get the "FTDI Programmer" under "Related Products" here http://www.multirotormania.com/on-screen-display/694-mrm-minimosd-.html?search_query=minimosd&results=7
Make sure you choose "straight pins", you won't need them but you can use them elsewhere, and choose "no" on the soldering option.
The base PDB of the ZMR250 kit has pins you solder into the board, then the full-size MinimOSD board just drops right on top of those pins. Put a drop of solder on each pin and that gets your MinimOSD board all connected.
After MinimOSD is soldered on, then you drop in your XRacer F303 flight controller board. On that board, you will learn that you have three UART serial ports. Each port has a matching TX and RX connection. On the PDB next to the flight controller will be a bunch of pins, two of which will also be marked TX and RX. These are the data inputs that go into the PDB and get routed to the MinimOSD board that you already soldered on earlier. You just have to solder in a jumper wire from the TX on the FC to RX on the PDB board, and then TX on the PDB board goes back to the RX on the FC.
If you are just starting out, I highly recommend getting some "jumper wires" that will make it easy for you to make connections from the pins on the flight controller to the pins on the PDB. I recommend this kit https://www.amazon.com/Kalevel%C2%AE-120pcs-Multicolored-Female-Breadboard/dp/B00M5WLZDW/ref=sr_1_2?ie=UTF8&qid=1466715356&sr=8-2&keywords=jumper+wire These can be used as-is or you can cut them to length and use them to connect components together to make sure everything works before you permanently solder down wires.
Lastly, remember I said the PDB makes all your connections for you. Near the back end of the PDB there will be a set of solder pads meant for your video transmitter. There is ground, battery power, and "reg" or regulated & filtered 12V power. You can use the "reg" and "ground" to feed power to your video TX. For a video connection, you can choose "cam" or "OSD". The "cam" solder pad will feed the video from your video camera straight into the video TX, and that is what you will see in your goggles...but that isn't what you asked for, you want voltage and RSSI. Therefore, solder the video input wire from your video TX onto the "OSD" solder pad, which is the video output from the MinimOSD you soldered on earlier. Done!
Later, you can use the FTDI adapter I told you to buy to upgrade the firmware in the MinimOSD and change the layout of the OSD display when you are ready.